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Home✈️Aircraft🚁HelicopterFuel-Helicopters New or Limited ActivityJS › Check your Tail Drive Shafts!
04-27-2009 03:24 AM  10 years ago
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James Kovach

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canton, oh - US

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Check your Tail Drive Shafts!
I was getting some odd noise from the tail drive of my Frenzy. I was thinking maybe the bearings were getting notchy. So I removed the tail drive setup to find this........

The top bearing was wearing a groove into the tail drive shaft. This is not the first time I have seen this. Century Hawk/Ravens have the same issue with their counter gear shafts. The problem is that the shaft is just a little too small for the inner race so the shaft spins inside the race rather then the shaft and race spinning together. So make sure you keep an eye on this. If left unattended too, it is quite possible for that to wear away enough that it will snap off.

The solution with the Hawk/Ravens was to red lock-tite the inner bearing race to the shaft. I would suggest you do this. Just make sure you have it installed before the red lock-tite sets up. Also, be very careful to NOT get ANY of the red lock-tite in the bearing. You wont have a bearing that spins anymore .
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04-27-2009 11:32 PM  10 years ago
James Kovach

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I just got done talking with Dan at Amain Hobbies. They pulled two helis that they have been flying to inspect the tail drive shaft and found that the shafts were wearing in the same manner. One was flown by Ben for around 15 flights. The other I do not recall how many flights. But they both had their tail drive shafts wearing.

Dan said they forwarded the info off to JS Models. So I am sure they will come up with a solution. Hopefully just a harder shaft will fix the problem.

So I would pull your tail drives and take a look at that shaft. Last thing you want is that shaft snapping while in flight. If it is worn, you can use the shaft off the orginal assembly if you still have it. Just make sure you lock-tite the bearing inner races to the shaft. This should take care of the problem.
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04-28-2009 01:49 AM  10 years ago
Isaac F

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Panama Republic of Panama

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Just make sure you lock-tite the bearing inner races to the shaft. This should take care of the problem.
I will recomend to use LOCTITE 609 because is designed for the bonding of cylindrical fitting parts.

The Loctite 609 is a thin green liquid similar to the Loctite 290

Isaac

Here is the info on the Loctite 609

Retaining compound is used when press or slip fitting cylindrical components that are not threaded. It fills the gaps between parts, creating a rock solid connection. 609 formula is an all purpose, quick curing compound that is perfect for general press fit applications for gaps up to .005" that will not be exposed to excessive heat. 620 is a high heat slip fit formula that will withstand temperatures of up to 450 F and fill gaps up to .015" while sealing the metal and preventing corrosion. 638 is a super heavy duty compound for use in high stress applications, for slip fit applications of up to .010".
Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak
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04-28-2009 02:43 PM  10 years ago
Coolpowered

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Youngstown, ohio

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sparx, thanks for the info, I am recieving my frenzy today hopefully, and will take care of it on the build.YRCHA CLUB MEMBER
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04-28-2009 11:41 PM  10 years ago
kamlooper

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kamloops

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Mine is done too. I will be checking this shaft often, as the bearings are not the smoothest ones in the world...
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04-29-2009 01:45 AM  10 years ago
James Kovach

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canton, oh - US

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Got an email from Dan today. JS is going to start putting harder shafts in the tail drive systems. I would highly suggest you lock-tite your bearings if you haven't yet.
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04-29-2009 02:46 AM  10 years ago
Isaac F

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Got an email from Dan today. JS is going to start putting harder shafts in the tail drive systems.
Maybe you can talk with him in order that they made that shaft a little taller/longer in order to install a optional 3er Bearing Block on top of the belt pulley

Check bigwolf1 post about this:
http://runryder.com/t504513p1/

Isaac

.
Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak
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04-30-2009 04:27 AM  10 years ago
Coolpowered

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Youngstown, ohio

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The shaft is to loose in the bearing, they have to make the outside diameter larger to fit better or a smaller inside diameter bearing in it to fit the shaft tighter. I just put the kit together yeterday, and they had the new bearing block and tail pulley with the kit, and it is a real sloopy fit in the upper bearing. Like sparx said you will really have to use a gap filler locktight to take of it.YRCHA CLUB MEMBER
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04-30-2009 05:18 PM  10 years ago
Heimypilot

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Hengelo Netherlands

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Actually, I think it's quite normal to loctite your bearings to the axles. Other helicopter brands also do recommend this.

my other brand advises loctite 603 and put it in their kits. It is made for this purpose.

Steven.
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05-01-2009 07:38 PM  10 years ago
mlucia

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Essex Jct., Vermont

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I wanted to add that the wearing does not take long either.

Only a dozen flights on the heli and today I changed out the out of round tail gear to the red metal one and the shaft was wearing a bit.
All locktighted in now but I have to agree that the shaft tolerance needs to be tighter on the id of the bearing.

To those who wants to replace the pulley with the metal one from Rons you will need some shim washers that take up approx 1 mm.
(i used 3 from the t700 spare parts bag)
The original pulley measures 20.00 mm and the metal one is 19.00. Give or take.
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05-03-2009 01:37 PM  10 years ago
bclong211

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Columbia ,SC

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Tail gear
I haven't seen this wear on mine yet but I do have a question. I have and addendum to the instructions for the SE version and it has a different tail drive shown. I have a spare in the extra parts from the build but haven't compared it to the one from the factory that was installed. Can someone tell me the difference? More teeth? Less teeth?Different ratio on the tail?
I meant to do that!!!
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05-03-2009 04:31 PM  10 years ago
Coolpowered

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Youngstown, ohio

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bclong211, if you got the single gear up front that your belt rides on, the only difference that I know is the upper bearing is larger, because the original one was wearing out.YRCHA CLUB MEMBER
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05-03-2009 10:08 PM  10 years ago
bclong211

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Columbia ,SC

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Yea, It's the whole bearing/block/gear assembly.I meant to do that!!!
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05-05-2009 02:56 AM  10 years ago
bclong211

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Columbia ,SC

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OK just looked at the spare I was referring to in the kit leftovers and it is loose as heck. it wiggles back and forth alot. I guess it is time to pull the tail and check the one that came installed.I meant to do that!!!
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